破碎岩石气体渗透性的试验测定方法

为了测试采矿工程中松散破碎岩体的气体渗透特性,设计了与MTS815.02岩石力学伺服机配套的气体渗透仪和测试系统。依靠MTS伺服机改变压力和位移条件,渗透仪用以稳定破碎岩石并连接气体测试系统,接入气源、组成回路和测试气透特性等由测试系统完成。通过对几组破碎砂岩岩样氮气渗透性能的测试,结合考虑状态方程的渗透率换算公式,得出破碎砂岩气体渗透率随压力和粒径条件的变化规律。该测试方法和测试结果在研究采动破碎岩体瓦斯等气体流动规律方面具有重要意义。

A Testing Method for Determining the Gas Permeability of Overbroken Rocks

In order to test the gas permeability of overbroken rock mass in mines,a seepage instrument and its testing system was designed.The system can match the MTS815.02 servo-machine.MTS gives pressure or displacement conditions,and the seepage instrument encloses overbroken rocks.Besides,the testing system undertakes connecting to a gas bottle,organizing a circuit,testing data,and so forth.Several groups of crushed sandstone were employed as the samples of gas permeability testing.Their gas infiltration rates are obtained from the testing data by a transformation considering the equation of gas state.Furthermore,the rule of infiltration rate with pressure and rock size variations is also achieved.The present method and the obtained results provide necessary preparation for studying gas flow features,such as methane delivery features in overbroken rock mass.